7.8

CVE-2025-40173: linux

CVSS: 7.8v3.1HighDeferred
AliasesUBUNTU-CVE-2025-40173DEBIAN-CVE-2025-40173
Published 12-11-2025Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2025-40173 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.15% chance of exploitation in the next 30 days, higher than 4% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.15%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 47 · Related 45
DLA-4379-1DLA-4404-1OPENSUSE-SU-2025:20172-1SUSE-SU-2025:4393-1SUSE-SU-2025:4422-1SUSE-SU-2025:4505-1

Timeline

  1. 12-11-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: net/ip6_tunnel: Prevent perpetual tunnel growth Similarly to ipv4 tunnel, ipv6 version updates dev->needed_headroom, too. While ipv4 tunnel headroom adjustment growth was limited in commit 5ae1e9922bbd ("net: ip_tunnel: prevent perpetual headroom growth"), ipv6 tunnel yet increases the headroom without any ceiling. Reflect ipv4 tunnel headroom adjustment limit on ipv6 version. Credits to Francesco Ruggeri, who was originally debugging this issue and wrote local Arista-specific patch and a reproducer.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.15%

Chance of exploitation in the next 30 days

Percentile

4%

Versus all other CVEs

30-day change

+0.01 pp

From 0.14% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.15%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu152 products
  • linuxAll versions (No fix recorded) | < 5.15.0-170.180 | < 6.8.0-106.106 | < 6.17.0-14.14
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1100.107 | < 6.8.0-1050.53 | < 6.17.0-1007.7
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.158-1 | < 6.12.57-1 | < 6.17.6-1
Linux1 product
  • linux≥ 8eb30be0352d09165e94a41fef1c7b994dca0714, < 566f8d5c8a443f2dd69c5460fdec43ed1c870c65 | ≥ 8eb30be0352d09165e94a41fef1c7b994dca0714, < 11f6066af3bfb8149aa16c42c0b0c5ea5b199a94 | ≥ 8eb30be0352d09165e94a41fef1c7b994dca0714, < 402b6985e872b4cf394bbbf33b503947a326a6cb | ≥ 8eb30be0352d09165e94a41fef1c7b994dca0714, < 10fe967efe73c610e526ff7460581610633dee9c | ≥ 8eb30be0352d09165e94a41fef1c7b994dca0714, < 48294a67863c9cfa367abb66bbf0ef6548ae124f | ≥ 8eb30be0352d09165e94a41fef1c7b994dca0714, < eeb4345488672584db4f8c20a1ae13a212ce31c4 | ≥ 8eb30be0352d09165e94a41fef1c7b994dca0714, < b6eb25d870f1a8ae571fd3da2244b71df547824b | ≥ 8eb30be0352d09165e94a41fef1c7b994dca0714, < 21f4d45eba0b2dcae5dbc9e5e0ad08735c993f16 | 4.7

3 vendors · 154 products

References

41 links
Show all 41 references